如何使用连接表创建多模型tag_cloud？

I have a join table

我有一个联接表

create_table "combine_tags", force: true do |t|
  t.integer "user_id"
  t.integer "habit_id"
  t.integer "valuation_id"
  t.integer "goal_id"
  t.integer "quantified_id"
end
create_table "c